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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-dict-decomp-tokenfilter.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-dict-decomp-tokenfilter.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/analysis-dict-decomp-tokenfilter.html" rel="nofollow" target="_blank">../en/analysis-dict-decomp-tokenfilter.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<span class="breadcrumb-node">Dictionary decompounder token filter</span>
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<div class="titlepage"><div><div>
<h2 class="title">
<a id="analysis-dict-decomp-tokenfilter"></a>Dictionary decompounder token filter<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/dictionary-decompounder-tokenfilter.asciidoc">edit</a>
</h2>
</div></div></div>

<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>In most cases, we recommend using the faster
<a class="xref" href="analysis-hyp-decomp-tokenfilter.html" title="Hyphenation decompounder token filter"><code class="literal">hyphenation_decompounder</code></a> token filter
in place of this filter. However, you can use the
<code class="literal">dictionary_decompounder</code> filter to check the quality of a word list before
implementing it in the <code class="literal">hyphenation_decompounder</code> filter.</p>
</div>
</div>
<p>Uses a specified list of words and a brute force approach to find subwords in
compound words. If found, these subwords are included in the token output.</p>
<p>This filter uses Lucene’s
<a href="https://lucene.apache.org/core/8_5_1/analyzers-common/org/apache/lucene/analysis/compound/DictionaryCompoundWordTokenFilter.html" class="ulink" target="_top">DictionaryCompoundWordTokenFilter</a>,
which was built for Germanic languages.</p>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-dict-decomp-tokenfilter-analyze-ex"></a>Example<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/dictionary-decompounder-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>The following <a class="xref" href="indices-analyze.html" title="Analyze API">analyze API</a> request uses the
<code class="literal">dictionary_decompounder</code> filter to find subwords in <code class="literal">Donaudampfschiff</code>. The
filter then checks these subwords against the specified list of words: <code class="literal">Donau</code>,
<code class="literal">dampf</code>, <code class="literal">meer</code>, and <code class="literal">schiff</code>.</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">GET _analyze
{
  "tokenizer": "standard",
  "filter": [
    {
      "type": "dictionary_decompounder",
      "word_list": ["Donau", "dampf", "meer", "schiff"]
    }
  ],
  "text": "Donaudampfschiff"
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/917.console"></div>
<p>The filter produces the following tokens:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ Donaudampfschiff, Donau, dampf, schiff ]</pre>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-dict-decomp-tokenfilter-configure-parms"></a>Configurable parameters<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/dictionary-decompounder-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="literal">word_list</code>
</span>
</dt>
<dd>
<p>(Required*, array of strings)
A list of subwords to look for in the token stream. If found, the subword is
included in the token output.</p>
<p>Either this parameter or <code class="literal">word_list_path</code> must be specified.</p>
</dd>
<dt>
<span class="term">
<code class="literal">word_list_path</code>
</span>
</dt>
<dd>
<p>(Required*, string)
Path to a file that contains a list of subwords to find in the token stream. If
found, the subword is included in the token output.</p>
<p>This path must be absolute or relative to the <code class="literal">config</code> location, and the file
must be UTF-8 encoded. Each token in the file must be separated by a line break.</p>
<p>Either this parameter or <code class="literal">word_list</code> must be specified.</p>
</dd>
<dt>
<span class="term">
<code class="literal">max_subword_size</code>
</span>
</dt>
<dd>
(Optional, integer)
Maximum subword character length. Longer subword tokens are excluded from the
output. Defaults to <code class="literal">15</code>.
</dd>
<dt>
<span class="term">
<code class="literal">min_subword_size</code>
</span>
</dt>
<dd>
(Optional, integer)
Minimum subword character length. Shorter subword tokens are excluded from the
output. Defaults to <code class="literal">2</code>.
</dd>
<dt>
<span class="term">
<code class="literal">min_word_size</code>
</span>
</dt>
<dd>
(Optional, integer)
Minimum word character length. Shorter word tokens are excluded from the
output. Defaults to <code class="literal">5</code>.
</dd>
<dt>
<span class="term">
<code class="literal">only_longest_match</code>
</span>
</dt>
<dd>
(Optional, boolean)
If <code class="literal">true</code>, only include the longest matching subword. Defaults to <code class="literal">false</code>.
</dd>
</dl>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-dict-decomp-tokenfilter-customize"></a>Customize and add to an analyzer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/dictionary-decompounder-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>To customize the <code class="literal">dictionary_decompounder</code> filter, duplicate it to create the
basis for a new custom token filter. You can modify the filter using its
configurable parameters.</p>
<p>For example, the following <a class="xref" href="indices-create-index.html" title="Create index API">create index API</a> request
uses a custom <code class="literal">dictionary_decompounder</code> filter to configure a new
<a class="xref" href="analysis-custom-analyzer.html" title="Create a custom analyzer">custom analyzer</a>.</p>
<p>The custom <code class="literal">dictionary_decompounder</code> filter find subwords in the
<code class="literal">analysis/example_word_list.txt</code> file. Subwords longer than 22 characters are
excluded from the token output.</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT dictionary_decompound_example
{
  "settings": {
    "analysis": {
      "analyzer": {
        "standard_dictionary_decompound": {
          "tokenizer": "standard",
          "filter": [ "22_char_dictionary_decompound" ]
        }
      },
      "filter": {
        "22_char_dictionary_decompound": {
          "type": "dictionary_decompounder",
          "word_list_path": "analysis/example_word_list.txt",
          "max_subword_size": 22
        }
      }
    }
  }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/918.console"></div>
</div>

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